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  • St. Patrick’s Day (Ireland)

    Saint Patrick's Day, or the Feast of Saint Patrick (Irish: Lá Fhéile Pádraig, lit. 'the Day of the Festival of Patrick'), is a cultural and religious celebration held on 17 March, the traditional death date […]

  • St. Joseph

    Saint Joseph's Day, also called the Feast of Saint Joseph or the Solemnity of Saint Joseph, is in Western Christianity the principal feast day of Saint Joseph, husband of the Virgin Mary and legal father of Jesus Christ, celebrated on 19 […]

  • New Moon

    New Moon 2025

    New Moon. By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely […]

  • World Meteorological Day

    The World Meteorological Organization is a specialized agency of the United Nations, based in Geneva. It "is dedicated to international cooperation and coordination on the state and behaviour of the […]

  • Christopher Clavius SJ, born 1538

    Christopher Clavius, SJ (25 March 1538 – 6 February 1612) was a Jesuit German mathematician, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed […]

  • Tullio Levi-Civita, born 1873

    Tullio Levi-Civita, ForMemRS (English: /ˈtʊlioʊ ˈlɛvi ˈtʃɪvɪtə/, Italian: ; 29 March 1873 – 29 December 1941) was an Italian mathematician, most famous for his work on absolute differential calculus (tensor calculus) and its applications to the theory of relativity, but who […]

  • Francesco Zantedeschi died 1873

    Francesco Zantedeschi (August 20, 1797 – March 29, 1873) was an Italian Catholic priest and physicist. A native of Dolcè, near Verona, Zantedeschi was for some time professor of physics and philosophy in the Liceo of Venice. Later he accepted the […]

  • Cesar Chavez Day, born 1927, Yuma, AZ.

    Cesar Chavez (born César Estrada Chávez, locally ; March 31, 1927 – April 23, 1993) was an American labor leader and Latino American civil rights activist. Along with Dolores Huerta, he […]

  • April Fools Day.

    April Fools' Day or April Fool's Day (sometimes called All Fools' Day) is an annual celebration on April 1, commemorated by practical jokes and hoaxes. The player(s) of the joke(s) or hoax(es) often exposes their action by […]

  • Full Moon

    Full Moon 2026

    Full Moon 2026

    The Full Moon rises at sunset, and is visible all night. The Vatican Observatory's monthly Full Moon Meetup for Sacred Space Astronomy subscribers is held at 10:00 AM Tucson time.

  • International Day of Human Space Flight.

    The General Assembly, in its resolution A/RES/65/271 of 7 April 2011, declared 12 April as the International Day of Human Space Flight “to celebrate each year at the international level the beginning […]

  • The Pope’s Astronomer: Lessons from a Decade Leading the Vatican Observatory

    Moderator Dr. Kirsten M. Ellenbogen has a conversation with Brother Guy Consolmagno. When: Friday, April 17, 2026 - 11:30 a.m. - 1:00 p.m. Doors at 11:15am / Lunch at 11:30am / Forum begins 12:00pm Where: The City Club of Cleveland 1317 Euclid Avenue, Suite 100 Cleveland, OH 44115 More info and tickets here.

  • J. A. Fleming died, 1945 (b. 1849).

    Illustration from the Bibliographical Memoirs of Fellows of the Royal Society, 1945. The Royal Society, London. Sir John Ambrose Fleming FRS died in 1945, aged 95 (born 29 November 1849). […]

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